Microtiter plates support a wide range of workflows, from development to high-throughput screening. Choosing the wrong plate type, however, can compromise both experimental design and reproducibility, and here is why.
Every assay has an ideal setup. For luminescence, white microtiter plates are widely accepted to deliver the strongest and most reliable signals. © Green Elephant Biotech.
Luminescence is an umbrella term describing the emission of light by a substance in response to a chemical (i.e., chemiluminescence, CL), enzymatic (bioluminescence, BL), or other physically-distinct reaction. This term encompasses other familiar concepts such as fluorescence and absorbance, yet extends beyond them by offering a wider detection range and refined sensitivity — features that have made luminescence particularly suitable for automation (1).
The advancement of photon-tracking technologies opened the door to an array of luminescence-based applications. Luciferase and reporter gene assays, for example, have become cornerstones for real-time monitoring of gene expression — a defining component of Cell and Gene Therapies (CGT). Similarly, ATP assays quantify cellular metabolism and are routinely used as proxies for assessing viability, cytotoxicity, or even microbial contamination (2).
In most research laboratories, single-use microtiter plates are indispensable consumables for a wide spectrum of studies, luminescence assays included. Among them, 96-well plates stand out as one of the most standardized formats, available in a variety of designs (e.g., flat-bottom or U-bottom wells) and in several colors – typically white, black, or transparent (3).
Here, we will explore three commonly used luminescence applications in cellular and molecular biology, with a focus on how to choose the right 96-well microplate and why that choice matters.
The technique that illuminated biology
Luminescence assays, particularly CL and BL, form a major part of the analytical toolbox in cellular research. Their applications span an impressive range, from forensic testing at crime scenes to high-throughput screening in drug development. Attempting to summarize every known luminescence assay would be ambitious to say the least.
Even without a deep background in CL, most people recognize its most familiar example: the luminol test used at crime scenes to reveal traces of blood. Unlike fluorescence, CL does not require an external light source, which underlies its high detection sensitivity. This is particularly valuable when the target molecule, such as a low-abundance enzyme, is difficult to quantify, making CL-based ELISA an attractive option.
However, CL also comes with its set of limitations like poor target localization, weak tissue penetration, and a short signal duration, making it poorly suited for in vivo monitoring (2). Those are the instances when BL is preferred, where substances like luciferase rely on the enzymatic oxidation of a subtrate — typically luciferin — to produce light.
Integrating luciferase or its gene into a cell unlocks a remarkable variety of trackable biological processes. Yet even this powerful method is not without constraints, as limited spatial resolution and challenges in precise quantification remain well-known limitations of BL assays (1).
Choose right plates, choose white plates
There was no doubt that plate color can influence the outcome of luminescence experiments — but why? Empirical comparisons between clear, black, and white microtiter plates show that the white ones have the strongest ability to reflect the light produced during a luminescent reaction, effectively amplifying the measured signal.
For instance, when compared with their visual opposite, black plates, white 96-well plates produce a signal intensity (in relative light units, RLU) that is five-fold higher at the same ATP concentration. In addition, the signal-to-blank ratio, which defines an assay’s quality by comparing meaningful signal to background noise, is also markedly improved when white plates are used for luminescence assays (4).
Although white microtiter plates with clear wells and fully transparent plates perform slightly better than entirely black ones, the difference remains significant. Having established the advantage of white plates concerning luminescent readouts, it is equally important to note that this preference does not always extend to fluorescence or absorbance.
In fluorescence measurements, black plates consistently deliver the best signal-to-blank ratio, whereas transparent plates remain the accepted standard for absorbance assays (5). This phenomenon reinforces a key message — understanding the fundamentals of the assay is essential for selecting the correct microtiter plate format.
There is more to the story than the color
While plate color is a critical methodology-related choice, sustainability in scientific research carries comparable weight. In 2014 alone, laboratories worldwide generated 5.5 million tonnes of plastic waste, identifying the life sciences sector as one of the largest contributors.
The incineration of single-use polystyrene — a common material for laboratory plastics — further intensifies greenhouse gas emissions, deepening the environmental burden (6). These realities have fueled the development of plant-based alternatives designed to maintain scientific rigor while reducing environmental impact.
Green Elephant Biotech® 96-well microPLAtes are made from polylactic acid (PLA), a biopolymer that offers a significantly reduced carbon footprint. Compared with conventional plastics used in laboratory equipment, PLA emits only 50% of the associated CO₂, saving approximately 220 g of CO₂ per plate (7).
Despite their difference in the primary component, microPLAtes are fully compatible with commonly used reader devices and meet industry standards across the analytical workflow, from early discovery to development stages. Similarly, our white 96-well microPLAtes demonstrate a reliable performance in luminescence assays, including the applications highlighted earlier.
As luminescence-based assays continue to shape how we study cells, pathways, and therapeutic mechanisms, the choice of microtiter plate remains a subtle but decisive factor in data quality. White plates elevate luminescent readouts by maximizing signal strength and minimizing background noise – a significant advantage that can determine the quality of cell viability assessment or an ADME study.
These same principles extend to more specialized analyses, including stem and mammalian cell characterization (e.g., iPSCs and HEK-293), where sensitivity and reproducibility are crucial. 96-well microPLAtes reflect the effort of improving a conventional piece of equipment without compromising these requirements.
By pairing reliable performance with a reduced environmental footprint, they offer a sustainable alternative that integrates seamlessly into discovery and development pipelines. Whether in a protein interaction study or pathway investigation, 96-well microPLAtes guarantee robust and high-quality results.
Interested in our work?
Check out our application notes for Green Elephant Biotech ® 96-well microPLAtes and more of our products today. Keep reading about microplate evolution and sustainability in their manufacturing here.
References:
- Luminescence. (2025). Molecular Devices, LLC. Available https://www.moleculardevices.com/technology/luminescence (Accessed 24 November 2025).
- Yan, Y, Shi, P, Song, W, Bi, S, Chemiluminescence and Bioluminescence Imaging for Biosensing and Therapy: In Vitro and In Vivo Perspectives (2019), Thernostics, pp. 4047-65. doi: 10.7150/thno.33228.
- Well plates: sizes, variants and their application in the lab. (2025). Green Elephant Biotech GmbH. Available https://greenelephantbiotech.com/blog/well-plates-sizes-variants-and-their-application-in-the-lab/ (Accessed 24 November 2025).
- The Ultimate Guide to Troubleshooting Microplate Assays. (2024). BMG LABTECH. Available https://bitesizebio.com/81249/troubleshooting-microplate-assays/ (Accessed 25 November 2025).
- How to choose the best microplate colour for my assay. (2025). BMG LABTECH. Available https://www.bmglabtech.com/en/howto-notes/how-to-choose-the-best-microplate-colour-for-my-assay/ (Accessed 25 November 2025).
- Tan, YH, Ong, HC, Ali, RAR, Gew, LT, Environmental and economic impact assessment of single-use laboratory plastic waste: A case study (2025), Clean Waste Syst, pp. 1-11. doi: 10.1016/j.clwas.2025.100389.
- Joseph, TM, Kallingal, A, Suresh, AM, Mahapatra, DK, Hasanin, MS, Haponiuk, J, Thomas, S, 3D printing of polylactic acid: recent advances and opportunities (2023), Int J Adv Manuf Technol, pp. 1015-35. doi: 10.1007/s00170-022-10795-y.
